john clark says his people found counterfeit versions of 60 different pfizer drugs from last year. that's up to 20 from 2008. >> the better counterfeiters might put in 10, 20 even 30% of the active pharmaceutical ingredient that's supposed to be in the medicine. >> reporter: they test,0 thousas of products a year. it found fake cancer, fake heart, fake cancer drugs and even fake chapstick. >> they will do a number of testing. fp the packaging doesn't demonstrate it's counterfeit then they go to the medicine itself. >> reporter: this is an audio clip that pfizer gathered. >> we can still make 50,000 pill a month. and that's by hand. >> reporter: the company shares information with law enforcement which conducts the actual raids and makes arrest. those counterfeiters were caught but plenty are not. >> joining me now from fda headquarters dr. margaret hamburg. do you know of actual harm of someone taking these medications? >> absolutely. these products can have none of the active ingredient that people need. they can have too much or too little. they can have toxic ingredients. they c